I got my bike today! Drove it straight from the shop to an unfamiliar trail (needed to beat the heat).
(As I probably don't need to repeat) I have the regular rims but 2.6/2.4 tires. The shop guys in chief commented as I rolled it out the door that it looks much better that way - that they would set up all their demo SB5s that way next year (hey, neat, I started a trend!), but that they expected Yeti would be sending fatter tires with the bikes next year, anyway.