I was looking at the Detailed Specifications of the Thinkpad x41T here and noticed that they included their popular ThinkLight which illuminates the keyboard in low light conditions and the Trackpoint is the newer TrackPoint with Press-to-Select [:D]
The memory specifications are confusing with the main memory of 256MB or 512MB soldered to the system allowing for limited memory upgrade.
"Expandable with SODIMM module to a maximum of 1.28MB or 1.536MB " I hope they mean GB, kinda confusing... ;)
Dimensions & Weight with each of the batteries:
Depth:
- 242mm (9.5in) with 4 cell battery
- 266mm (10.5in) with 8 cell battery
Height:
- Minimum: 29m (1.14in)
- Maximum: 32mm (1.26in)
Weight:
- Minimum: 1.61kg (3.5lb)
- Maximum: 1.84kg (4.0lb)
Approximate operation and charging hours are:
- Power off/suspend charging**:
- 2.7 hours, 4 cell battery
- 4.2 hours, 8 cell battery
- Charging during operation **
- 3.5 hours minimum, 4 cell battery
- 4.3 hours minimum, 8 cell battery
- 6.0 hours maximum, 4 cell battery
- 12.0 hours maximum, 8 cell battery
- Battery operation:
- Up to 2.6hr *, 4 cell battery
- Up to 6.3hr *, 8 cell battery
Not bad for an all day computer/tablet by adding an inch and a 1/2 pound to the unit.
Slowly more and more options are appearing on the IBM website, just found the parts breakdown here:
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-60008

So hopefully one could easily upgrade the base model to bluetooth by adding the IBM Integrated Bluetooth IV with 56K Modem (BMDC-3).
So far only one model ThinkPad X41Tablet 18695CU, has been made available for sale with a shipping date of 2+ weeks.
Prices of available accessories:

Pricing and SKU options are available here:
http://www.pcconnection.com/Search.asp?Term=x41+tablet&Offset=0&DefSort=Y&om=search
Can't wait to find out more... [:D]