It looks like Sony will be making a big announcement at the 2011 CES.  Today, a “tablet PC” from the company made a surprise appearance on the FCC.  The device, known as the PCG-31211L, won FCC approval for its 802.11 b/g/n wireless capabilities and Bluetooth, and an outline of the device was disclosed in label location photos, above.

We don’t know much else about the tablet.  However, FCC documents do show that the device uses Sony’s VGP-BPL21 battery – the same battery used in the company’s F, NW, CW, Y, S, B and SR series notebooks.  That suggests that the PCG-31211L will be a full sized tablet – not a palm top device or iPad clone.

Internal and external photos of the PCG-31211L will remain confidential until January 20th, 2011.  This suggests that Sony is likely to show off the device at this year’s CES, which takes place just two weeks before the device’s confidentiality expires.

We’ll keep you updated as we learn more.