The SQL 2016 exams are indeed still in beta (70-761 & 70-762), but I would still recommend pursuing those certification exams since they are the most current:
MCSA: SQL 2016 Database Development
You will still get full credit for passing the exam, however, the results may take a few weeks for you to get back from Microsoft:
Exam 70-761
Even though the official Microsoft Press Training Kits aren't out yet, any material geared for 461 & 462 exam study should still be relevant enough to help you prepare for the new exams.
https://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=mcsa+sql+server
Also, there are some excellent FREE online training videos available at Microsoft Virtual Academy you should check out:
Microsoft Virtual Academy
Hope that helps,
Phil Streiff, MCDBA, MCITP, MCSA
