It seems there's been no changelog since quite a while so here's one highlighting the most recent changes related to scripting.
Sorry if that's not the right category, please move accordingly.
New script commands:
chr
ord
gettimer
getunits
getvariableofpc
can_use_command
has_permission
addchannelhandler
removechannelhandler
setunitdata
getunitdata
getunitname
setunitname
getequipisenableopt
getequippedoptioninfo
getequipoptioninfo
setequipoption
navigateto
Modified script commands (extra parameters):
strcharinfo
strnpcinfo
addtimer
deltimer
addtimercount
checkoption
checkoption1
checkoption2
setoption
warpparty
warpguild
classchange
New params:
BankVault
Big projects currently in development:
Implementation of the official Clan system
Implementation of the official RoDEX system
Implementation of the official Achievements system
Complete rewrite of the map cache system