According to the upcoming issue of Shounen Sunday
, Hayate no Gotoku!
will receive a new OVA series as part of the manga's 10th anniversary project. One episode each will be bundled with volumes 41 to 43 of the manga, for a total of 3 episodes. Volume 40 will be released on March 18th.
via Baidu, ANN
Update March 23
It was revealed on Web Sunday that first OVA will feature both Nagi and Hinagiku.
Source: Web Sunday
Hayate no Gotoku! OVA