Hey - I don't have time to post a full recap of last night's episode (maybe OTW can do it for you later today)... but here's the gist of what happened as found on the official GG website.
As Valentine's Day approaches, Rory (and Logan invite Lorelai and Luke to spend a weekend with them at Logan's family's house on Martha's Vineyard. Rory and Logan have a wonderful time, but Lorelai is upset by Luke's unfriendly attitude toward Logan. Luke's attitude changes when he realizes he forgot to buy Lorelai a Valentine gift, and Logan saves the day by letting Luke give Lorelai one of the gifts he had bought for Rory. When Lorelai finally confesses to Luke that she is worried the wedding will never take place, he reassures her that they will get married soon. The weekend ends in an ugly scene when Logan's father, Mitchum Huntzberger, arrives and berates Logan for ignoring his responsibilities in the family business.
My quick addition: Mitchum is mad at Logan for blowing off a trip to London for a meeting with some of his business associates in order to spend the weekend with Rory. During the screaming match (which everyone witnesses), he tells Logan that he will be spending a year in London running the company -- starting the day after his Yale graduation. This obviously interferes with plans that he and Rory have been making for a six-week trip to Asia over the summer. He assures Rory that the trip is still on, but you can tell Rory is doubtful.
That's all I've got time for right now... sorry!