Not too much difference in terms of timing actually. Wonder Festival 2010 [Winter] will be on February 7th, while the release date for the online limited release version will be one day later than that (February 8th).
The price is 15,540 Yen (inclusive of tax).
Another goodies from Yamato at the event is the pre-order for Shunya X Mitsumasa Asuka Langley's figurine at Studio Reflect's booth, as mentioned in this previous posting.
All images from Yamato: Link 1, Link 2.