Question:

Should we be discussing our future plans or just our next move?  

I think having a plan is important but if we discuss it openly, it will be impossible to surprise our opponent. Essentially he will always know what we are planning while we can only guess what he is planning.

On the other hand if we only talk about our next move and noting else we may not end up with the best plan and our moves may end up being more reactive than proactive.

For the 12th move I still trying to decide between

12. a4     (attacking b5)
12. Rac1  (taking more control of the file)
12. Rfd1   (preparing d4)

At first I liked 12. a4 the best to induce weaknesses if black plays 12..... b4. However as foxpup pointed out when we were discussing 10. Nc3 this is unlikely to happen. Instead black may just defend by developing his queen to b6 in which case I am not sure what we have accomplished.