2013 was the planned completion date (last three stations are, UNC-C, Mallard Creek Rd, and I-485 P&R). Opening to 36th Street mainly involves rail yard issues (first of which is crossing the CSX Charlotte/Monroe line which I believe carries a lot of freight) and potential construction of a NS Intermodal yard at the airport frees up a lot of space at the N Tryon railyard. There is another rail line that goes off toward Stanly County that has to be crossed as well, otherwise the LR can stay in the NCRR Corridor when trackage issues are resolved. I believe Charlotte has only bought the corridor as far as I-277 (the NCRR ROW runs UNDER 277, then past Alpha Mills where it meets the CSX line.)
The toughest and most expensive part of the NE line is past Sugar Creek when it moves over to N Tryon, and especially the Harris Blvd crossing (underground? elevated??)
Funding issues may be paramount, however, in deciding whether to phase the line