Have there been any announcements about practices, alumni game or college games before the January 1 game?
No. Rumor on the Caps forum is there apparently won't be any other games. Not a huge surprise there wouldn't be college games given that there aren't any high-profile local programs. The Caps used to do a periodic alumni game at Kettler, but so far there's been no info on any sort of event at Nationals Park. Seems like it'd be a nice way to make a little money while earning some PR points with fans who can't afford tickets to the main event or were shut out in the various ticket processes. Have an alumni game the day before, sell maybe 20,000 tickets for $10 each, and away you go.
I wouldn't be surprised if weather concerns might factor into not scheduling extra events, given the DC area's notoriously fickle weather at that time of year.
But I have no doubt this year's Winter Classic will come across looking less "inspired" than in other cities where they turned it into something of a festival.