Is that to avoid the glitch where you lose your experience points and have to start from rank 1 all over again? Do they save the data on their servers? If that's the case, this update is awesome for this feature alone. I worried constantly that I would experience that glitch after one of my friends lost his experience points at level 48, just two levels shy of the 50 achievement.

As far as I understand this message is there as a reminder to not leave and lose 1500 points. The rank 1 glitch is a different part of the update but is in affect. Hope this wasn't written to confusing and help out.      

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Gold account - Gapper 402
30,000+ Zombies slayed

Hmm.. Still not quite getting it. Did they do something with TU4 to eliminate or at least lower the chances of the rank 1 glitch or not?

Yes. There is no more rank 1 glitch. The message at the end of the round is totally different, it is only a reminder they added to not leave the game and lose 1500 exp.

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Gold account - Gapper 402
30,000+ Zombies slayed

 Gapper Killer wrote:

Yes. There is no more rank 1 glitch. The message at the end of the round is totally different, it is only a reminder they added to not leave the game and lose 1500 exp.

Awesome! Thanks for the info.. ;)