Looks very interesting indeed - Here's the summary and link below.
So far we were mostly unimpressed by the build quality of most Tamron lenses. However, we are happy to report that things have improved with the Tamron AF 24-70mm f/2.8 SP Di USD VC. The lens barrel is mostly made of plastics but it is of high quality and it is tightly assembled. The new weather sealing is very welcome, of course. Same goes for the very fast and silent USD (ultrasonic AF drive). The Tamron lens has one unique selling point: it is the first fast standard zoom lens to feature an image stabilizer and based on what we have experienced during the field trip we would rate it with a 3 f-stops efficiency. Your mileage may vary here a bit into the one or the other direction depending on your shake characteristic.
The Tamron AF 24-70mm f/2.8 SP Di USD VC is not a perfect lens - none really is - but regarding the sum of its qualities it is obviously the best standard zoom for Canon EOS at this stage - at least till the Canon EF 24-70mm f/2.8 USM L II enters the scenes. However, in any case it will be very hard to beat from a price perspective!