What does this email mean?

[Slutha]

Slutha,
Committee supported you as a TA, however the final decision has not been 
made at administrative level yet. You should receive a letter soon.
Stay tuned,
-Dr. XXXX

[fuzzylogician]

It means the committee decided to award you funding on a TAship, and now there is some administrative process that they need to go through to get it officially approved. Sounds like they don't expect any problems and unless something goes very unexpectedly wrong, you will have this position.