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Just been through all the archived spec PDFs:
HB-M678 is listed as 32 or 36h in the 2012-2013 specs, but a lot of places seem only ever to have stocked the 32h version.
The specs for 2010-2011, 2009-2010 and 2008-2009 list both HB-M778 (Centrelock) and HB-M758 (6-bolt).
Before 2008, 15mm thru axles didn't exist yet according to Shimano.
So I'm probably looking for hubs delisted 6 years ago or 4 years ago, in a hole count that was unfashionable even then.
Emyr-
I know the forum doesn't have much love for Tredz, but they've never given me any trouble
http://www.tredz.co.uk/.Shimano-HB-M758-XT-Front-Hub_92611.htmSingletrack say they can get them
https://www.singletrackbikes.co.uk/m7b231s424p14691/Shimano_Deore_XT_HB-M758_Front_Hub_with_6_Bolt_Disc_Mount_15_x_100mm/RS_GB/36437As do Triton
http://www.tritoncycles.co.uk/components-c9/hubs-c120/shimano-hb-m758-xt-front-hub-p9093/s22023I got my M758 in 36H from one of ze German shops, can't remember which one but none of them have them any more.
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HB-M778 36h
ebay.de is also worth a look:
http://www.ebay.de/itm/Shimano-Deore-XT-HB-M788-15-mm-Vorderrad-Nabe-NEU-Centerlock-36-Loch-QR15-/272368802885?hash=item3f6a721c45%3Ag%3AhUUAAOSwdzVXqNJg
HB-M758 36h
gbj_tester
svenhöek
I'd take a used XT over a new Hope :)
HB-M758 in 36H are still out there if you want 6-bolt