As you can see, BTC has been trading within a triangle (some say it could be a bull flag , so I would say it has 70% chance of breaking above), although it still is a triangle so there are chances it may break below.
I'm planning to play this move once it occurs and exit near the projected targets.
Bitfinex scheduled a 6 hour maintenance on January 7th, may be tricky as we may see the triangle breaking out in next 24-72 hours. They have mentioned that they will post-pone the maintenance if major moves do occur on Monday.
We have a breakout. Altcoins are following but some are still within their triangles (EOS, IOTA, NEO) so there is more room for them to follow up soon and gain in their xxx/BTC pairs.