A couple other points: mining is exploding as well with the global GHash rate / Difficulty accelerating. I have not calculated an exact correlation between price and compute but it could be an indicator of "real" moves in the currency.
The truest indicator is of course price-action. During last summer and into the fall, before Beijing implemented capital controls, when you observed the depth of book on orders on BW, you'd notice that the vast majority of orders were for even lots of ~0.0100BTC. This was indicative of algorithmic market making. Very few orders were above 100BTC. Now it's the exact opposite. Large orders with fast fills are common. I wish I had some real data and actual stats on the order book during the run-up ;( as I believe it would make a good indicator as to whether the current move is sustainable...