Wouldn't expect 2.0 for a LONG time. Was at #CLUS this year and while TACACS question was asked the response was the same. Roadmaps weren't specifically discussed, but 2.x certainly wasn't on their horizon anytime soon. If you need TACACS, run ACS. ...
I am in a similar situation, where I have my own personal Lab (for this purpose, my own MSE 3310 w/ a few single WIPS/CAS licenses) and I've just bought some T2 tags off ebay.Not looking to spend $$$ as it is not company/corporate funded but for educ...