Unfortunately I don't qualify as big enough to have received the 3.5 preview, so I can't really comment on that. I just had what I thought was a really good idea that noone seemed to have done yet. Evidently it was a good idea as you seem to be working on it as well and I think Midnight probably covers some of the same ground too.
We chose to rework the base classes after our initial feedback suggested that people wouldn't like a product that said it required both D20M and D&D. Therefore we just say it requires D&D and rework the basic clases with a fantasy feel to it. Therefore instead of strong, fast, tough, smart, dedicated and charismatic heroes we have warriors, thieves, outlanders, scholars, devouts and destined. We kind of stray a little into the D&D core classes a bit, but the talents and feats structure is there, if slightly amended.
cheerio,
Ben