Quick update...
The M4.4 TT software is ready. However, the problem up until now has been testing it in a car because I only had an 850 which used M4.3, and it was difficult to borrow a suitable test car for testing the M4.4 version of TT.
The good news is that today I have bought a V70 T5 M4.4 so I can now do as much testing as I want. So next Monday (13th) the TT M4.4 will be available for purchase in the UK, and then then in the USA very soon afterwards.
Please bear in mind that due to the extra complexity with converting the M4.4 ECU firmware, it takes longer to create a TT USB ECU for M4.4 than it does for M4.3, so at the moment it can take up to 5 days to convert one.
Please also note that due to the inherent M4.4 TT USB design, it's not really possible to keep lots of units in stock for all the different models. This will also add a bit more delay in the overall delivery time for those wishing to purchase ready-made units.