Windows 8.1 Update 1 is available at TechNet now..
Recommended Install Order
1. KB2919442
2. KB2919355
3. KB2932046
4. KB2937592
5. KB2938439
6. KB2949621
I installed the updates on my main PC yesterday, being able to pin Metro apps is handy, and everything feels more responsive.
Download now or wait until Tuesday.