i have same case as you. I didn't wanna file N400 too coz same reason. I will be travelling overseas in June with my extension letter if the 10 year is not out by then. i keep checking everyday but nothing. sigh.. btw, Texas filer here.
Is USCIS website down? It says "application is currently unavailable". i am kinda worried. I usually check my Case status every morning when i log in my computer at work. -Texas filer here.