In the meantime I use the little SB-N5 flash and it's surprisingly effective, much better than those dumb built-in things.
The SB-N5 is a pretty weak flash and for what it does is extremely expensive.
It's not all that expensive, especially considering the convenience of its very small size and that users won't have to worry about carrying multiple sets of different batteries. FWIW, Canon's 270EX sells for $129, Nikon's SB-400 for $120 and the SB-N5 for $146. Not a huge difference. Yes, the flash is weaker, with a guide number slightly less than 1/2 that of the SB-400, but it has advantages too. The 270EX and the SB-400 can tilt their heads, but the SB-N5 can also rotate its head.
Since the SB-N5 shares the V1's large battery, recycle times are fairly quick, about 3 seconds when the flash is used at full power and much less most of the time for the way I shoot. At ISO 400 it can produce good exposures up to 18 feet, which I find acceptable most of the time. It might not be enough if small apertures are used or the light is bounced, but the V1 can produce good images up to ISO 1600, so again, the V1 hasn't struck out. Its relatively low output power is beneficial for its intended owners. If it was as powerful as the SB-400, recycle times could reach 7 seconds, which is slow enough for irritate its users. Since the 270EX and SB-400 use AA batteries, their recycle times are competitive only when new (alkalines as fast as 3.9 sec.), fully charged (NiMH as fast as 2.5 sec.), new (lithiums as fast as 4.2 sec) and these batteries take progressively longer to recycle as they're used until they're ready to be replaced, at which point Nikon says that they're all taking up to 30 seconds to recycle. I haven't used the SB-N5 much so I don't know its recycle time when the V1's battery is low, but I'd be surprised if it is longer than 4 or 5 seconds by the time the battery is nearly depleted.
Also, the SB-N5 also has a Capture Illuminator that can light very close subjects for up to 6 seconds in Smart Photo Selector and Motion Snapshot modes.