Testing would be best. Probably best to cool my jets until I can. Don't really need to get an eMontion and then wait for a camera with an uncertain shipping date. Tempting though.
I would urge anyone not to buy anything that is not shipped and not tested as in the digital world, to come may mean to come for a long long time.
I also suggested testing in exactly the style and workflow you require.
Testing and processing a dozen files really means nothing, if you routinely shoot hundreds or thousand of files a day.
Testing in a dealers showroom also rarely tells you anythign, unless the show room allows for lighting and changing conditions.
There are two dealers, Dave Gallagher and Capture Integration and Steven Hendrix ad PPR digital (both in Atlanta) that rent and ship if your not local.
Test it on as close to a real project as possible, work your best deal, but never buy just becaus eit's cheaper.
Saving 10, 20 or 30% means nothing if you lose hours and weeks in added post production.
Also get everything in writing, returns, warranty, change of mounts, even get in writing things you might not ever need.
A good dealer will not mind this.
It's even less of a savings if you buy something that doesn't work for your needs.
And my last piece of advice. If the product is not yet available, forget about it.