Not necessarily.All new classes will appear in either a PH or a PG, after which they'll be expanded upon in a splatbook.
The Rouse said on these boards that the articles on DDI would be put in a compilation once a year, and sold. I recall, but may be wrong, that we would not see reprinting from DDI in other books.
There's been suggestions we probably will receive a class via DDI, and that if we do, it'd go into the compilation, not the PHBs.
If this is the case, then I would put money that the Bard will come to us via DDI, not PHBII.
After all, the only thing that the preview above mentions is "Sorcerer, Druid and Barbarian" - not Bard.