As we start to see more of these handsets in the wild, Sony have moved to update their support website to include the user guides for three of their newest Xperia handsets, namely the Xperia P, Xperia U and the Xperia sola smartphones, shortly before the handsets themselves are released officially.
The manuals are available to download from Sony in various languages in PDF format, from the following links:
The guides are quite extensive, giving simple instructions to enhance to use of these new additions to the Sony Xperia handset range and are 7MB of download and more than 140 pages long (sola manual is 145 pages in length, for example).