Toyota definitely knows of this issue. In fact the cracking dash issue also occurs on the Lexus GX 470. Seems the 2003-2004 years are more common but it could be a matter of time before it affects the later years.
Here's a thread at ClubLexus that documents this exact issue:
cracked...
Anyone know what the red wires on the battery are for? I didn't notice them on the other 4Runners I've seen. I first thought it might be for an aftermarket stereo installation but this is a Limited with Toyota Navigation.