Video Highlighting the changes:

Big feature list:

Added max time between frame control! No more long pauses, current hard coded value is 500ms, any longer than that gets cut off to keep the flow smooth.
Better playback handling! left and right arrow jumps forward/back 5 sec, comma(,) and dot(.) now can step through frames 1-by-1!
We now have caching, for monsters and other objects that move out of sight - this is done by tracking objects that are the most common on screen for the previous frame and then using that for every tile that is considered out of sight.
The character can now hold weapons and change forms
Added different display modes: you can switch around the places of tiles display and console with A, or for console purist a full console mode is available with S

Skeletons and corpses now somewhat represented
Better monster override rules(overrides happen mostly when specific monsters are in view), always room for improvement
Statuses are now colored
Text at the top now has useful info displayed
Taskbar now displays the DCSSReplay icon
Noise/Gold is now displayed
Show Lost Health/Mana