ZAP2it
http://blog.zap2it.com/frominsidethebox/2012/06/vampire-diaries-season-4-spoilers-whos-coming-to-mystic-falls.html
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ZAP2it tells us that first up is a 16-year-old girl named April. She’s from Mystic Falls originally so she remembers Jeremy (Steven R. McQueen) and Elena (Nina Dobrev) from their childhood, but she’s been away at private school for the last few years. She decides to move back to town after a death in the family so when we first meet her, she’s grieving. All we know so far is that she’s smarter than first impressions may convey.
Next is Connor, a “scary hot, highly trained killing machine.”
Both roles are recurring and will be significant in the first part of the season. Look for more on them — and no doubt a few others — shortly!