You are very misinformed about the MTH settlement, who is using specific manufacturers in China and Korea, and the release dates of particular models.
MTH's settlement was not with BLI directly but rather with Model Korea Trading Co. - MKT (formerly known as Korea Brass - KB) which supplies BLI and Lionel among others. The settlement resolved the last piece of the lawsuit between MTH, Lionel and KB. Lionel and KB were co-defendents. KB employees had stolen designs and production schedules from MTH's Korean supplier, Samhongsa. Criminal trials in Korea lead to the imprisonment of several KB employees. The evidence from the Korean criminal trials showed that Lionel's then Director of Engineering, Bob Grubba (now owner of BLI), was aware of and encouraged the theft. MTH used this evidence to file suit in US civil court. Lionel and KB lost their original trial and were ordered to pay MTH $40.8 million. Lionel filed for bankruptcy protection, appealed the case, and the appeals court remanded the case for a new trial. KB did not appeal and instead tried to evade the decision by reincorporating as a new company, MKT. A court ruling found MKT was in fact KB under a different name and was therefore liable for KB's debts, including the decision in the MTH suit. This lead to the settlement between MTH and MKT. In that settlement MKT agreed to pay MTH $950,000 in cash and to never again use the tooling based on stolen MTH designs, QSI agreed to drop its suits against MTH, BLI agreed to issue MTH and all other manufacturers royalty free sub-licenses to the Real Rail Effects sound patents, and certain Lionel and BLI locomotive tooling in MKT's possession were handed over to MTH. That tooling included the Lionel Challanger and Veranda Turbine, as well as six BLI tools (EMD F3, EMD F7, Alco PA, Alco FA, UP Big Boy, and GG-1 electric). No other tooling changed hands as part of the settlement. There was no agreement to "share" tooling. MTH now owns and posses the former BLI tools. KB agreed to make new tools for BLI in return. All of the above information comes from press releases by the interested parties and Erol Gurcan. Erol is a New York area lawyer and author for the Lionel Collector Club of America's publication The Lion Roars. Erol spent hundreds of hours personally attending Lionel's bankruptcy proceedings. Many of his postings and the press releases are still available on the CTT section of this forum and/or on the web site O Gauge Watch.
MTH and BLI use different manufacturers in China and Korea. After MTH's experience with stolen designs and production schedules they have become EXTREMELY protective of their intellectual property. After Samhongsa broke up in Korea MTH started their own factory there. The Korean factory makes most of the die cast zinc steam and electric locomotives, such as the GS-4 Daylight. BLI's steam locomotives are also produced in Korea but are made by MKT in a completely different factory from the MTH product. About the same time MTH set up their new Korean factory China changed its policy of foreign ownership of factories. MTH was able to purchase partial or total ownership interest in at lease four mainland China factories. Some of these factories only make products for MTH. Others make other non-train related products for people other than MTH. None of the factories makes train products for anyone other than MTH. MTH also owns a factory in Thailand that produces their transformers, decoders, command control systems, and other electronic products. Most of BLI's production in mainland China is handled by Sanda Khan. Sanda Khan makes train products for dozens of US brands, but not MTH. Sanda Khan was purchased by and is now a subsidiary of Kader. On June, 14th Kader sent letters to 60 smaller train manufacturers in N, HO, S, and O scales notifying them that they will no longer accept new orders. I have not yet learned if BLI was among those cut off by Kader. If so, it will obviously have an impact on where BLI products are manufactured.
Lastly, MTH and BLI are NOT issuing GS-4 models at the same time. MTH shipped their GS-4's and GS-6's more than a year ago. BLI has only recently posted photos of undecorated pre-production engines (very nice looking, BTW). It does appear that both companies will deliver the SP passenger cars in short order, but not the same cars at the same time in the same order. I received the first chair car from MTH this last week. BLI has not yet shipped any cars but has said they expect to ship the observation car first. There are also quite a few differences in the models visible in the sample photos posted of the two companies pre-production samples.
BLI articulated chair car
MTH articulated chair car
Just to name two differences, the MTH cars have much finer stirrups and grab irons while the BLI's diaphragms have the scissors gate extended across the vestibule. Some people have suggested that the BLI photos are of N-scale cars. I do not believe this to be the case. It is quite clear that the track in the photos is Kato HO Unitrack.