What would happen to a new sportbike if stored in an outdoor storage unit for 6 months?

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Yes, you'll need that battery booster. Oh well, that's something you know about. With luck, once charged that battery will be good again: maybe, maybe not. As for the rest, I personally wouldn't worry about it much. I've revived bikes that guys have let sit for years. I once bought a bike out of an outdoor shed that hadn't run in about three years, which took a bit more work: pulled and cleaned the carbs, whereby it ran great from then on. Current example: buddy of mine is storing a gorgeous bike in my clean and dry indoor garage (MV Agusta) that hasn't been run much since new in 2007 (April 2015, as I write this!). 1,500 miles total, and didn't run much if at-all from 2012 to late 2014. When received, I replaced the battery, made sure there was proper inflation in the tires, put in a little fresh gas, and rode it a couple miles. It really wasn't all that balky and ran great, through today. Now I run it every few weeks, and keep it on a battery tender part-time.

Hopefully you did not use fuel with ethanol in it. If you stored it with fuel still in the float bowls, the ethanol could eat the carb seals. This happened to me. Lesson learned. Fortunately, Ninja carbs are not very complicated at all and replacing seals is a walk in the park. You don't want to store a bike with dirty oil, so before you even attempt to start it up, change the oil. After you drain it, replug it and put a full quart in, let it sit for 20 minutes and then drain that out, too. That's the cost of a good quart down the drain, but you will be surprised at how much more crud it picks up and flushes out.

Honestly? 6 months isn't a big deal at all. Charge the battery, top off the tank with fresh gas, change the oil, and I bet it fires up no problem. Modern bikes aren't like the old carbureted ones where old fuel in the float bowls would gum up the whole system. I just took my EFI Harley out of storage, and put the battery back in. It fired up right away and ran great after 5 1/2 months.

Remove battery and trickle charge it a 2 amps for 5 to 8 hours- if it is a 10 amp/hr battery then 5 hours, a 16 amp/hour battery gets the 8 hours. suck out the old gas in fuel tank- Harbor Freight has a pump for $9.95. Put in fresh, no ethanol gasoline with a double shot of SeaFoam in it - as 2 ounces to the gallon instead of one ounce to the gallon. Check oil level- some difference of opinion here, about 1/2 the people will start and run the cycle with overwintered oil for 20 miles or so and then change it warm, others will do a 'cold change' so it is started with mostly fresh oil for couple hundred miles before next change. Sort of depends on how clean it looks and did it get fresh oil before storage. Air up tires, battery charged and fresh fuel? remove spark plugs, squirt in a tablespoon of engine oil or WD40 to loosen rings, put in high gear and push it around 20 foot or so to turn engine over without spark plugs or put on center stand and spin back wheel- the idea is get cylinder walls lubed, ring grooves lubed, valve seat and valve guides get some lube. Engine will be happier when plugs in and start, ride around. this is common drill in spring in Wisconsin, did it to Suzi couple weeks ago. Gold wing in shed 10 miles from home is next on the list

Yea, Gasoline with the ethanol in it is hydroscopic and in the humid Florida climate it will absorb moisture. You'll hopefully get away with draining the tank and a fresh fill and all will be good.

Your fuel is going to be toast.. You should drain the tank, put new fuel with a good fuel system cleaner, and hope your injectors aren't clogged.