Aside from all the other improvements folks here have mentioned, I am also excited these are handheld. I think DQ games work very well handheld.
I own DQVIII (bought a used PS2 copy a few years back) but have barely played it since long-ass RPGs are just hard to devote serious home-time to these days. That and the load times in and out of the many, many random battles are nigh-on intolerable. I am ever hopeful this issue will be resolved with the re-make. Even still, I am less bothered by these things on the bus for whatever reason.