Yes he may be getting ready to drop it. DD dropped hers 2 months short of being 3. I did try every other day but that very quickly became none for us. So I started introducing quiet time, first in her bed, didnt work, then my bed, she read books but then started asking to come into my bed at night time, something she never did so I scrapped that. Now she does quiet time on the couch with a dvd.
It took dd a good 2 months to get used to having no nap, during which we had night wakenings and early mornings despite being put to bed earlier. She has just now gone back to 12 hour nights and I had to wake her the last few mornings.