Apparently Harlequin is ending their Blaze line in 2017. (possibly to be replaced by a new "super sexy" line that will be digital only).
Also Harlequin Historical and Harlequin Romance will be digital only.
I've just seen authors remarking on the decision on social media. Haven't been able to find an official announcement to link to yet.
(Googling "Harlequin ending Blaze" certainly didn't get me the results I'd anticipated

)