The WGBY-DT power on 22 will be the same as on 58, but they will be non-directional and higher on the tower. On top of that, being lower in frequency means it will have better luck with the terrain in the area.
Just to clarify a few things there Trip. WGBY-DT 22 is going to be a top mounted antenna, in place of the old analog 57 antenna. WGBY-DT was directional to compensate for the side mounted antenna.
WWLP-DT is going to boost from the current 10 kW to 15.8 kW at some point in the future, but the 10 kW is considered to be a fully-license full-powered signal in and of itself. WWLP's last FCC filing indicates they have no plan to kill their analog signal before 02/17/09.
WWLP-DT is at full licensed power, but isn't full powered by any means. At that HAAT, their power should be roughly 17.1kW.
The 15.8kW brings them a lot closer to the fully licensed power. WWLP remains on the panel antenna currently used, so no early shut down would be needed, unless
the old transmitter dies a painful death.
WGGB is going back to 40, which requires a re-working of the RF plant (replacing filters, installing new mask filters, etc). The shut down of analog in December allows for that work to commence.
Starting in December you are going to see a lot of early analog shut downs, reductions in power.