Hell yeah, thanks for more news.
Look like the upgrades are:
health/first aid icon=healing upgrade for priests or total health upgrade
shield icon=total creep unit health upgrade
gold bars icon=mine gold income rate upgrade
hammer icon=total creep unit weapon damage upgrade
breastplate icon=total creep unit armor/defense upgrade
portal icon=creep unit recruiting rate upgrade
some skull thing icon=???
unit icons=escalation classe, levels are likely:
Level 0=5 minotaurs-->
Level 1=5 minotaurs+4 archers-->
Level 2=5 minotaurs+4 archers+2 preists-->
Level 3=5 minotaurs+4 archers+2 preists+2 catapultasauruses-->
Level 4=5 minotaurs+4 archers+2 preists+2 catapultasauruses+4 angels-->
Level 5=5 minotaurs+4 archers+2 preists+2 catapultasauruses+4 angels+2 giants