I purchased a T3 Lite in November and it has the 2-4 lb. adjustable trigger. I bought mine off the shelf though so that could be a difference. I read over the information on Tikka's website and all it mentioned was that the T3 trigger was adjustable from 2-4 lbs. I hope this is just a nasty rumor about the trigger as I feel it is a definite plus for the Tikka.
On to your question about the rings. Mine did not come with the OptiLock rings. It came with some aluminum Tikka rings. Not bad but I did not like how they clamped around your scope and the scews seemed very soft. Reminded me of the Weaver rings that hook on one side and screw down on the other. After considering Warne, Talley, and Leupold, I installed a set of Warne rings which are solid steel. Probably overkill for my application but I want my scope mounted solid. The Talley mounts look great too but I just wanted to use steel.
I think you will be happy with the 30-06 and the Tikka.