Out of interest of this thread I just perused the Hoegaarden website and discovered all their beers are wheat beer, they don't make anything else. So I'd assume you would catagories their beers in the following wheats, farmhouse, low alcohol and specialties. I've always looked at Grand Cru's (as a style) being placed in the Strong Dark or Specialty groups, for Hoegaarden Grand Cru I lean towards the Specialty class as it is basically a wit on riods.
Mind you I'd love to try their Rosee and Citron they look great and at 3% ABV I reckon they'd be great to neck after mowing the lawn.
my 2c