House and Cuddy making out at the end of the last episode I saw. Tonight, no mention of any of it, what is going on there?

nope, not an item, though according to the cast and crew there will be madami House/Cuddy (Huddy) moments to come. i highly recommend watching all of the episodes in between joy and locked in if you haven't already seen them. but for madami explanation of their situation or optimum huddiness watch: the itch, let them eat cake, Joy to the world, and the softer side; those should give you magpabago of their situation. hope this helped.

Were you watching in America?

Last week, on American television, the repeated the season 5 episode 'Joy' in which House and Cuddy kiss. That was the 6th episode of the season.
This week, however, they aired 'Locked In', which is episode 19 of season 5.

Hope that helped! Or maybe it confused you more...