I think that you mean 2014 dates, as so far the DL fare rules do not list any blackout dates for 2015.
I just pulled up the DL fare rules, and this is what it says:
FARE RULES TEXT UNLESS OTHERWISE SPECIFIED NOTE - RULE EFSM IN IPRG APPLIES GENERAL RULES TEXT UNLESS OTHERWISE SPECIFIED IF THE FARE COMPONENT IS ON ONE OR MORE OF THE FOLLOWING ANY KE FLIGHT OR IF THE FARE COMPONENT IS ON ONE OR MORE OF THE FOLLOWING ANY KE FLIGHT IN COMBINATION WITH ONE OR MORE OF THE FOLLOWING ANY AE FLIGHT ANY AF FLIGHT ANY AM FLIGHT ANY AS FLIGHT ANY AZ FLIGHT ANY CI FLIGHT ANY CZ FLIGHT ANY DL FLIGHT ANY G3 FLIGHT ANY HA FLIGHT ANY KE FLIGHT ANY KL FLIGHT ANY KQ FLIGHT ANY MH FLIGHT ANY MU FLIGHT ANY OK FLIGHT ANY RO FLIGHT ANY SU FLIGHT ANY TN FLIGHT ANY UX FLIGHT ANY VA FLIGHT ANY VN FLIGHT ANY AR FLIGHT ANY FM FLIGHT ANY MF FLIGHT ANY ME FLIGHT ANY SV FLIGHT ANY VS FLIGHT TRAVEL IS NOT PERMITTED 29JAN 14 THROUGH 03FEB 14 OR 03MAY 14 THROUGH 06MAY 14 OR 16MAY 14 THROUGH 01JUL 14 OR 18JUL 14 THROUGH 24AUG 14 OR 05SEP 14 THROUGH 10SEP 14 OR 03OCT 14 THROUGH 05OCT 14 OR ON 09OCT 14 OR 11OCT 14 THROUGH 12OCT 14 OR 10DEC 14 THROUGH 31DEC 14. IF THE FARE COMPONENT IS ON ONE OR MORE OF THE FOLLOWING ANY CI FLIGHT OR IF THE FARE COMPONENT IS ON ONE OR MORE OF THE FOLLOWING ANY CI FLIGHT IN COMBINATION WITH ONE OR MORE OF THE FOLLOWING ANY AE FLIGHT ANY AF FLIGHT ANY AM FLIGHT ANY AS FLIGHT ANY AZ FLIGHT ANY CI FLIGHT ANY CZ FLIGHT ANY DL FLIGHT ANY G3 FLIGHT ANY HA FLIGHT ANY KE FLIGHT ANY KL FLIGHT ANY KQ FLIGHT ANY MH FLIGHT ANY MU FLIGHT ANY OK FLIGHT ANY RO FLIGHT ANY SU FLIGHT ANY TN FLIGHT ANY UX FLIGHT ANY VA FLIGHT ANY VN FLIGHT ANY AR FLIGHT ANY FM FLIGHT ANY MF FLIGHT ANY ME FLIGHT ANY SV FLIGHT ANY VS FLIGHT TRAVEL IS NOT PERMITTED 24JAN 14 THROUGH 03FEB 14 OR 01JUN 14 THROUGH 31AUG 14 OR 10DEC 14 THROUGH 31DEC 14.
Note that it is only thorugh the end of 2014. It seems that you can book (at least it's displayed online, not sure will it ticket) any KE flight Jan 1, 2015 and onwards, as it's not (yet?) blacked out. (I am sure that if that is so in error, that our friends and DL will very soon correct that. Or could it be that there will be no more blackout dates as of 2015? But that seems highly unlikely, as it's not the type of "enhancement" that DL is known for.)