Posted by Yegg on the NA forums:
Season Two is ending with the next patch, but since we’re still working on a couple issues, we won’t actually be patching tonight. This means that the season has been extended until the patch is ready to be released, and everyone has some additional time to qualify for rewards. However, note that on the night when the patch goes out, we’ll be shutting off ranked queues several hours earlier than usual.
As for rewards: Victorious Janna, summoner profile banner trims, and loading screen borders should be available as soon as the servers come back up. Summoner icons and forum badges will show up in the days following the patch.
Thanks for your patience and good luck in these final hours of the season!