Not if Archos has anything to say about it... They are worse leaches of of FOSS GNU/Linux than TomTom or Tivo are...
I bought two Archos 604Wifis, expecting an experience similar to the PMA430, but what I got was a hardware locked device. That said, I never updated the firmware to the latest, so my 604s could theoretically use the html exploit to give me a root shell and (temporarily until next boot) install apps...
You'll be better off spending your hard earned dough on a brand spanky new Nokia N900... It uses the new Maemo 5 (the next generation of Maemo), is supposedly not locked, and has wifi, bluetooth and 3G... and can be a phone. Plus orbiter software has already been ported to Maemo. Probably just needs a re-compile to support version 5...