This hasn't been widely talked about publicly but it's really relevant information to this question...
Since InvadR, much of the top brass in Busch Gardens Williamsburg's marketing department has departed. Dan, the previous VP of Marketing, was promoted to Orlando. Ron, a professional journalist prior to his stint at BGW and Dan's second in command, has also left the company in the last couple months.
I'd not expect the new marketing leadership to take the same chances Dan was willing to unfortunately. Hopefully they'll prove me wrong.
It's certainly possible that they will add some additional Killarney alterations later on down the line, but no one I've talked to and nothing I've seen has suggested that this project will expand beyond the front left corner of the hamlet.
I'll see if I can make impacts of the addition a bit clearer in my next article. Long story short though, it's impossible that a flat ride this large not leave quite a mark.
