R/3 Enterprise - upgrade path?

hi folks,

we are planning to go from 46c to r/3 enterprise 470 with extensions set 200 - and under WAS 640.

as us was told the first version of 470 with 200 runs on was 630(you can read that in a lot of sheets of sap) and i read in this forum that was 630 is a java-only was, we got a bit irritated.

- is the first base-release for 470 with ext.set 200 was 620 or already was 640 ?

- when will 470 with was 640 be available?

- will 640 ever be available for r/3 enterprise?

- is it possible to start with 470 and ext.set 110 and was 620 and then switch only the was to 640?

thanks for any information

oliver