Hey hey,
Let's clarify a few things i can talk about....
Remember, if i do not reply to your Question, its not that i did not read it, but i am not allowed to talk about it
Homebrew
The 100% Homebrew Compatible statement was most probably miss-interpretation. It actually means "The guys behind DS-X are fully (100%) supporting the Homebrew Community" - Now i am not saying the DS-Xtreme is less compatible with homebrew then 100%, or more - I simply am saying the compatibility ratio on Homebrew has not been officially announced. However, i will most likely reveal more information on this in the following days.
Which slot does it plug into?
The DS Slot of course.
GBA Support
No GBA support has been announced for the DS-Xtreme. Which doesn't mean it won't play GBA Games forever, its just not been announced.
Can it run Regular regular' DS games like all other cards?
Yes it can, and will not require any patching anymore
Is there a plan for a MicroSD / Bigger Memory Version
Currently DS-X only announced the DS-Xtreme 4Gb package; Wheter a new model with MicroSD or bigger Memory will come out is future talk. DS-X is concentrating on the "now", and tries to give you guys a splendid OS and very unique features that surely will make up for the size. I think holding ~8 Games is enough, so for all those whom want to store their entire collection of Games on it, yeah sorry, the DS-Xtreme is not for you.
Then again, i am sure DS-X is not sleeping either in their hardware department. So who knows what they will do next. Only time will tell...
What does the interface look like? Is it fugly like the G6 or ridiculously simple and ugly like the Supercard.
I think the DS-Xtreme UI looks good from the GetGo
But indeed, a picture would say more then a thousand words
I will look into getting some more of the UI revealed and its looks, and how it is operated
Again, i am not ignoring Questions, but some of them; i cannot answer, and always to reply with a "No comment" or "It has not been officially announced" is kind of annoying for you guys too. I will try to get more info out in the near Future.... Stay tuned