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If in the MBpro 13" example, the dimensions stayed constant, and as you - Scottsdale, noted, the battery could physically grow because everything else in there shrank... we know the before and after overall weights (exactly same?), but do we have that info broken down to the battery, etc., etc. individually? Any number of items may have gone up/down in wt., to produce the new net total. Were old/new total wts. exactly = ? Wouldn't the battery weigh more per unit of volume, than other internals? If so, whether we're talking about revising the 13" Pro last month, or revising the Air next month or next year (as you suggested, with a rectangular case, letting battery volume grow) -- where do they / can they offset the weight of a bigger battery, plus maybe throwing in a 3G modem too? A non-tapered Air case has a slightly lower surface-to-volume ratio compared with the current tapered one (I'm assuming: case wt. being aproximately proportional to surface area, though shape affects wt. too), but if the revision does the needed stiffening of the lid (fixing the "white donut" problem), then I'm thinking that any little weight savings turn into a wash. New thought: Aluminum's a soft metal; does titanium work better for a svelte Air form? And is the hinge-area problem related to anchoring into soft metal, or bolting 2 soft-metal slabs together? Why did they abandon titanium for alum., and what are the pros and cons of each? New thought: Consider the keyboard etc. half's Longitudinal Section (cut left to right, so we're looking from front towards back or hinge). The current smaller tapers in the extreme left/right edge, could be deleted, to pick up a little more internal volume for more battery. This might also eliminate need for the pop-out jack door's weak detail, and allow one more conventionally-installed "future-type jack" of whatever type is most useful. Of course I am assuming that Apple is able, detailing-wise --for either my steeper-taper or your (Scottsdale) no-taper version -- to utilise any bit of new volume gained, in whatever shape or location. I guess the battery can ooze into any available space? Another new thought: Help dissipate heat, by increasing surface area on back, by adding a little outer-surface (and corresponging inner-surface) corrugation wherever it can be done without upsetting aesthetics. Like where it could double as a grip. This should cost nothing extra since it'd mean just different programming for the CNC router. (I could be wrong, but at NYC's beloved independent mac store on 23rd, I suspect their 'Air' display model has had 2? 4? of its rubber feet custom-replaced by taller non-Apple ones, to better ventilate the underside.) Last thought: In higher of 3? Air models, keep case size the same but change the screen to 12", for less battery load. Make the lost inch acceptable by using some better screen-tech, like OLED / touch. (Remember rumors of 2 nearly-same-size screen options in iPad, the higher-tech one being slightly smaller?) Ooh... then that makes the bezel get a little wider, making it work even better when used as a Casio G-Shock-like solar cell! LOL, I'm on a roll! The 2012 luxe version-3 model! There's lots to tweak and play with other than CPUs/GPUs in the Air's design, IF Apple still gives a hoot.