As I asked the question I feel I should add an answer of short.
Getting over this knee thing for starters.
Then a succession of reasonably long trail races (20, 26, 26) through the year where I'd like to chop some time off.
Sub 18 5k is a big goal, and chop some more time off my 10k (at 37:00 as it stands). Maybe try and get my half marathon down a couple more minutes closer to 80 minutes.
Oh, and if a road marathon should present itself I'd like to go sub 3 hours just to put road running to bed for me.
First, get over this knee thing.