I would be very surprised if this results in a new Titan sized Transformers toy that wasn't already intended (in the works).

Their first fan-vote toy was a Deluxe (Windblade), which was short packed and didn't become a highly sought after toy.

Their second fan-vote toy was a Combiner (Victorion), which isn't generating much enthusiasm in the fandom, to the point of it almost being forgotten before it has even been released.

This third one is at least an existing character that would be more exciting, but the people at Hasbro must be thinking that these fan-votes are a waste of their time... and would be too risky to gamble a Titan on it.

I think Scorponok would probably be the easiest to (re)work from the Metroplex mould... but since it is a public vote on facebook, I don't think it will be possible to rig the vote.