Titan as product is dead about 2 weeks ago. DataStax (Cassandra company) hired the Titan team, but not the product. They preferred to abandon Titan. Here the official announcement:
http://www.zdnet.com/article/datastax-snaps-up-aurelius-and-its-titan-team-to-build-new-graph-database/
"We're not going to do an integration. The play here is we'll take
everything that's been done on Titan as inspiration, and maybe some of
the Titan project will make it into DSE Graph," DataStax engineering
VP Martin Van Ryswyk said... But we're really going to build something
new because we're going to be able now to take advantage of Cassandra
specifically and DSE features specifically. It will be an engineering
effort to build a new product. We will not be supporting or
integrating Titan as a product into our portfolio."
And this is the official announcement in Titan group:
"However, there is also some sadness in this announcement. As we
transition to DataStax, we will find little time to contribute toTitan
and interact with the Titan community. We will miss that and hope that
it will be carried forward."
Now, some users was very pissed off about this news. Read this:
"Not even that. They pulled the plug without a stable product, no
prior notice and not caring about the companies that used a buggy
system that broke compatibility every time just because a version 1.0
was promised."
(source: https://groups.google.com/d/msg/aureliusgraphs/WtU6om8CtqI/Q1_AIFRA4mkJ)
So after few days of flame in the group, Titan team said "Ok, Titan is alive", but this has been the reaction on Hacker News:
https://news.ycombinator.com/item?id=9025798
I'm not talking about Titan vs OrientDB from technical perspective (I'm the OrientDB author, so it would be unbiased), but I'm just pointing here that creating a new project based on a dead product seems a not so good idea. So you can go with OrientDB or wait for the new Cassandra DSE (Commercial only?) with graph features "inspired" to Titan.