Yes you can select german language after flashing, on your phones screen you can select languages and it will configure it for german use if you like.
But when you flash the CSC your keyboard might be messed up, as said above.
"PS. This ROM has Swedish/Dannish keyboard layout. "
I just kept my CSC from my german winmo 6.5 stock rom B7610NDBTIK5
but flashed everything else(eboot, pda and phone) and till now I have not had any problems and my keyboard is still german layout.
As it is version 6.5 the start icon is in upper left corner as usual.
Changes you can read in first post pretty much everything is said there.
Maybe two more things,
the messaging app has really been improved, you can type a lot faster and don't have to wait so long until the letter is recognized, which is good for people who can type fast.
and if you have a DLink router and had problems using the internet that is solved somehow. I was able to use Opera and open websites for the first time since i have this phone
although i still have no real stable connection.