This is what i have got so far from Lee and other TGC employees.
1. When migration is released there will be NO support for Original X9 and X10
2. There wont be two applications it will be one with two build options for X9 and X10 and a test game in X9 or X10
3. We will get most of the features from Airmod in this version
4. We will get some of the features of Plysmod in this version
5. We will get all the FPSC X9 features (including those script commands)
6. X9 users will get all the FPSC X10 features minus maybe DarkAI and a few like GPU instancing that only works on X10
7. There will be NO source code for the migration version but the source for the latest original version will be released to us
There is talk of Lee already having started the migration thats why we havnt got an upgrade for X10 or X9 for about 3 weeks now.
Hope that helps a bit