I wouldn't hold my breath waiting for DO to provide "shared" SSL certificates. That strikes me as sort of a shared hosting thing, and DO is decidedly not shared hosting.
If you need SSL for your own use, it's easy enough to create a self-signed certificate. If you have a public-facing site that needs a certificate signed by a recognized CA, those are easy enough to get also. The best deal I've found so far is a basic single domain certificate for less than $10 a year at namecheap.com.