Sell some of my miners, take the "profit" and invest in Bitcoin itself.
I'm not running a huge farm, so I'm more than likely going to cut my losses prior to the Havlening. Won't sell off my miners until a few weeks after the Halving, just to see how much more difficult things get.
I have a feeling in last few weeks pevious gen will take a decent jump down. Current gen... not sure on it unless something else better comes out.
I would not wait till last minute. I sold mine a bit back on last gen, and invested in coins. So far I did much better then I would have mining older gear (I have normal not cheap electricity)
I think the current 14 or 16 nm miners are already out. They are being "tested" by the manufacturers to mine a lot of coins.