I had a mailshot from another vendor which says they should be out this Month
"This month, Intel is giving NUC a big shot in the arm, by releasing two new NUCs based around the 4th generation Core architecture, also known as Haswell. Both models are available as motherboards or kits (motherboard plus case) and include either a Core i3 4010U processor or a Core i5 4250U chip soldered onto the motherboard. The former has two Hyper-Threaded cores running at 1.7GHz with 3MB of cache while the latter runs at 1.3GHz but can Turbo Boost up to 2.6GHz depending on how hot the chip is running. Unlike the i3 version, the i5 version also has the new Intel HD 5000 on-board graphics, which is a lot faster than previous Intel GPUs.
Both of the new Haswell NUCs have similar core features, such as two SO-DIMM sockets, two mini-PCI-E slots and six USB 3 ports. The latter is a huge improvement over earlier NUCs, which only supported USB 2. Another major upgrade is the addition of a SATA 6Gb/sec port onto the motherboard. This means that for the first time that you're not limited to using mSATA SSDs, but could plug in a 2.5in or 3.5in hard disk into your NUC, case permitting. This opens up all sorts of new possibilities for the Haswell NUCs, such as recording TV streams without having to rely on an external storage device such as NAS box. "
Probably one of the only laptops with HD5000?