Saw this played at Essen 2010; it was popular, looked pretty fun and seemed nicely lightweight
K2 is a board game in which each player controls a team of 2 mountaineers, trying to climb to the summit of K2 and return before the other players' teams and before the mountain kills them. Every player uses an identical deck of cards. You use the cards to move your climbers on the route pictured on the gaming board, or to acclimatize the members of your team.
You can also set up a tent and wait for better weather. You will have to choose your path carefully, as the other mountaineers can block your way, and watch the upcoming weather which can lower your acclimatization to 0, thus killing your climbers.
K2 is a hand management game for 1-5 players, with strong interaction and low luck factor, lasting up to 60 minutes. The theme is very well represented by the mechanics, including such elements as changing weather, lack of oxygen and death of the mountaineers. The result is an exciting match for gamers and non-gamers alike.
The box includes, among other materials, a double-sided board with two different routes to the summit (easier and harder) and two sets of weather tiles (for summer and winter).