I like the new design. The only thing that bothers me is that gear 4th feels superior to gear 3. I can only hope gear 2 and gear 3 will develop more into their own fighting style (for example, luffy being very nimble "monkey-like" in gear 2, dealing precise damage). I would have loved gear 4 if it was just an alternative to gear 2 and 3 instead of being something superior (well, luffy stated he needed gear 4 to defeat huge beasts on the deserted island so I guess he couldn't defeat them with gear 2 and 3?). Can't wait to see the rest of the crew develop more monster-like techniques that look absolutely inhuman.. Except for Usopp ofcourse.
Also G3 can still be developed to affect his entire body. Could be used against giants etc.