Curtains opened sometime in March. DHP will probably be contracted until late this year, maybe even up until March next year (he is a bigger name star, so I'm not sure if this affects how long one stays with a show).
Strickland's been in Tarzan awhile, so I wouldn't be surprised if he left the role within the next few months.
And yeah, Spring Awakening cast is contracted through November. I have a feeling some of the cast will renew their contracts because they all are dedicated and seem to enjoy what they're doing!
"We like to snark around here. Sometimes we actually talk about theater...but we try not to let that get in our way." - dramamama611