Questions on MI 2.5 Architecture

Hello,

I have a few questions regarding the technical infrastructure of MI 2.5 to be able to plan its roll-out.

Will there still be the abap stack and java stack on the was 640 supporting MI 2.5 ?

If yes, is it possible (and does it make any sens) to split abap from java in order to have a firewall between them ?

Thanks you for your answer,

Christian.