Yes I think that the whole point is for Archos to keep their features and just add Android on top, which will enable third party applications, smartphone features and more.
To be honest, I think that is great!
However, using my Archos as a phone seems like it should belong as an add-on function much like the GPS or amazing Head-Cam add-on. I am unsure exactly yet what Android is or does besides being an operating system, so I haven't thought it out. Maybe the creative minds at Archos will surprise all of us yet again for a third time in a row in September of 2009.
If it is as Charbax says, then I vote wait for Android-enabled Archos.