In my story for OhmyNews I quoted a statement from the London Book Fair that the iPad has got five fonts in ePUB mode. A comment has led me to this blog where it appears there are lots more.
I still think that ePUB is intended to be mostly text and because the screens can be small the less design the better in terms of anything fancy. A paperback from the 1930s had some colour on the front but the pages are mostly continuous text in the same font. not very exciting maybe but paperbacks did get better. So I think 5 fonts would be ok. But thanks to