My vote is for intentional. Most likely, the devs realize that the moment they release an Int/Con race, unless it is godawful beyond the stat bonuses, it will become the optimizer's go-to option for most arcane caster builds.
Eh... It wouldn't be much better than Dex/Int, and there are plenty of those. I'd rather see a Str/Int, though... For all those Slayer and Magus builds. :)
we need a +Strength/+Dexterity Race with a Charisma Penalty and a +Strength/+Constitution Race with a Charisma penalty so we have decent martial races besides human because the human bonus feat is an advantage no race can compete with.
Other than Paladin, I think Half-Elves, Half-Orcs, Aasimar and Tiefling are superior choices for pretty much every martial class.