With the PT results in, Battle for Zendikar has mostly shaped up to be the story of Gideon and a bunch of lands. Expeditions ended up being more common than anticipated, but still rare enough to command hefty price tags. Prices declined rapidly at first, but now the price graphs have mostly leveled off.

Fetches and duals have dropped by around 50% from pre-order prices across the board, with so-called "tango lands" dropping only about 30% from their pre-order prices. I expected the new lands to drop by a larger margin, but it looks like there's enough demand for now to keep them in the $40+ range.

The tango cycle is likely to decrease in value after it leaves Standard, though they are good Cube and EDH inclusions. The fetches and duals, alternatively, will assuredly only creep up after packs of BFZ stop being opened. If you're interested in owning these bad boys, I'd act on it sooner than later.