Whoa. A few things.
First, Babel, attacking Ken Winner's work ethic is just plain ridiculous. Ken is probably the hardest working person in this entire industry. I have literally had the head designer for another brand complain to me that Ken works too hard and that he simply can't compete with that kind of work ethic. As to the specific complaint about that little patch... I have not heard a single dealer or customer complain about the lack of the patch, and I have not seen any signs of wear on anyone's kites (or my own completely thrashed demo quiver). I rarely do this for fear that I'll awaken some sleeping viper den, but here it goes... If anyone has any type of premature wear on your canopy due to chafe against the new inflate valve on the 2014 Rebel, please let me know. We've sold tens of thousands of Rebels and I have not seen a single complaint so far.
For the record, Ken was given the option to have the patch added to the kites and he chose not to for weight saving purposes as he did not think it was necessary. He may have chosen to add it to the 2015, but there's every chance that this decision was based not on improving the kite, but simply because there is a perception that it is needed. In fact, Babel, he may have made that decision because of the posts you've put up here about it. If that is the case, congratulations, you've made the 2015 Rebel a few grams heavier because of your inanities.
And just as another thought, every time I get a new bike (I have a lot of bikes) I go over the whole thing and cover any potential wear/chafe spots with clear helicopter tape. I wouldn't blame anyone for doing the same thing to their kite with patches of sail-repair tape, though again, in case I haven't stressed this enough, I don't think it's necessary in this particular spot.
The only information I have so far on the new Neo is that it will have a little more top end, but we were pretty happy with the 2014 and feedback has been extremely positive so I don't think it will get a huge rework for 2015. As far as flying it on 4 vs 5 lines, I haven't had any feedback on that. Even the Dice, which is the first kite I've heard actually flies differently on our 4 vs 5 line bar, the difference isn't huge and I've actually had a really good rider tell me he prefers the kite on 5-lines. Do us all a favor and get (or just demo) the kite KO and fly it with your 5-line bar. If it flies well then save yourself the cost of the bar and fly it like that. If you think you lose some performance then you'll have to decide if it's worth the cost to pick up a bar as well. Either way, let us know what you find.
As Billy said, other kites like past Evos and Dynos and Fuses have had no noticeable difference between linesets as far as I could tell from feedback at demos and from dealers/customers.
If anyone has any questions on any of this stuff (or if you want to tell me I'm wrong on the whole canopy-wear-patch thing) feel free to drop me a PM.