There have been some changes to the website this weekend, and there will be more coming over the next week. The most important one is the new Developer's Diary section, and the ability for backers to create accounts to view the newest Developer's Diary entry.
Keys for this will be sent out to all backers of the appropriate tiers sometime tomorrow, which will allow you to sign up.
Meanwhile, tileset support progress has been chugging along, with quite a bit of chatter about refining it in IRC this weekend. Sean's code is publicly available on his repo already, but there's still plenty left to do.