You have to remember that the only time we've seen a 'fresh' Froome, well the new '11 version anyway, go all out on a grand tour climb is still just in that Pena Carbaga stage of the 2011 Vuelta against Cobo.* And from what I remember that was pretty spectacular, so god knows what awaits us in July. I'm not someone who thinks he could have taken massive time out of Wiggins on the Tour climbs last year but we still don't really know how good this new alien Froome really is.
* There was also the ''little dig'' on PDBF after he'd pulled on the front for 2km that left the defending champion looking like a mug.
Here's the Pena Carbaga attack for anyone who's forgotten:
https://www.youtube.com/watch?v=V5GxKr1XLtk Quite extraordinary.