The good news (for TiVo owners) is that you can do most of the things you expect, like manage recordings, search for TV shows and even create the new OnePass setups that pull from TV and internet sources. The bad news is that on the web, it only searches the sites that are available so far or regular TV, so there's no way to see if something if it's on Netflix or Amazon Prime, for example. In-home streaming works across devices if you have a newer Roamio DVR, or one of the older ones with a Stream attached. That even includes ChromeOS (although it pops up a warning when you first try to log-in citing "reduced functionality"), although the quality is just acceptable. Until now, the company hadn't done much to update its online interfaces, which were mostly the same as they were in 2010 and in 2006 when it was called TiVo Central Online, so at least this is something.
According to the accompanying PR, a way to stream or download TV even when you're away from home (on PCs, it's already possible via apps) is in the works, but it might be tied to just a single device at a time, and may not work with every show because of DRM.
I think the idea is to create something that not only works for TiVo users, but also pulls in viewers who haven't purchased a TiVo yet. It already had a similar setup for RCN customers with TiVo, but now it's available to anyone. On the second point they still have some work to do (if you need a way to find what's on streaming, check out our list here), but if you already have a TiVo it's a convenient way to watch on your laptop.