WLVI in Boston has been airing some promos for the CW network itself, but I haven't seen anything regarding WLVI's branding under the new network. Presumably it's not going to be CW 56, as they've spent the last few years trying to slowly become "Boston's WB". Perhaps they'll just go by "Boston's CW"?
Anyone know how any of Tribune's other big market stations are transitioning? As Marc noted below, WPIX will be known as CW-11. However, WPIX has built a strong identity around the WB brand. Some of Tribune's other stations, most notably KTLA and WGN, are better known for their call letters than their affiliation. I'd expect that the two stations will keep their identities as they are, but could CW-5 and CW-9 be en route? I believe that WGN has been doing about the same transitioning so far as WLVI; in any case, Tribune will have quite some work in the month ahead, seeing that most of MNTV's O&Os have their new identities in place.
And speaking of MNTV, WZMY has been airing ads for MyNetworkTV, which include the new logo that says "My TV New England".