The tongue is fixed, it is connected on the instep side. Lock laces may well be the way to go for fast transitions. I have never felt like I needed them before.
It is encouraging that past versions are living up to milage claims.
I really just tried the locklaces on my road shoes because the shop I bought them from gave me a pair for free. I was coming back to "longer than 5mi at a time" running after a LONG hiatus, so my feet were swelling like crazy at the time. Put on the lock laces and my feet stopped falling asleep during runs. Then I started appreciating how easy it was to get in.
I'm working on finding my groove for transition where I can just have the locklaces as tight as I'll need them for the run, and just forcing my foot in. A guy I train with does that with Pure Cadences, hook one finger in the back, pull back HARD to get the foot in, and it goes in, no tying, no pulling, just running.
To your point about the mileage claims, although the Pure Cadence isn't the exact same shoe, it's the same materials and same style construction. That guy I mentioned has over 500miles on his PC's, from last season.