I can't see any kind of offical press release but interesting to see they've finally done it. Rumours were that this was the pre-cursor to the Bold release, we'll see.
FYI: the software is available (as of 2352 on Thursday night) for:
8820 handheld code (4.5.0.52(2))
Curve 8310 handheld code (4.5.0.55)
Pearl 8120 handheld code (4.5.0.55)
Pearl 8110 handheld code (4.5.0.55)