Premiere Pro and 4:4:4 32-bit float

In one of the Adobe TV videos Jason Levine explains that Adobe Premiere Pro "automatically upsamples media upon import to 4:4:4 32-bit float." Can someone please explain the technical meaning of the 4:4:4 and the 32-bit part and how this effects how we work with video in Premiere Pro in a little more detail?
http://tv.adobe.com/watch/adobe-evangelists-jason-levine/staying-native-or-going-intermedi ate-transcoding-and-premiere-pro-cs5-/
Start watching at 5:40 or so...
Thx in advance.

See http://en.wikipedia.org/wiki/Chroma_subsampling
4444 is simply RGBA (red, green, blue and alpha) or as Adobe calls it BGRA with 8 bits per channel, thus the 32 bit format. The practical effect is that with certain effects, like chroma keying or CC the loss is minimal. However, this only applies to certain types of video like RED 4K or EPIC 5K. MXF material for instance is still handled as YUV 422.
Some plug-ins like DissolveMaster also upsample to BGRA 4444 to avoid losses and do it even with YUV 420 or YUV 422 material.

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