Congrats!
I got my number in an email from BPELS today, so check your email. If you didn't get the email, make sure you have everything submitted. Fingerprints and take home exam etc.
In my email there are instructions on the next steps (getting your stamp, renewing at end of March, etc) as well as what laws and board rules you will be responsible to know.
Pretty awesome seeing the letter start off with "Congratulations! You are now a California licensed Professional Mechanical Engineer..."
You can also check the license lookup and search for your name.
http://www2.dca.ca.gov/pls/wllpub/wllqryna$lcev2.startup?p_qte_code=ENG&p_qte_pgm_code=7500