KINGDOMS FORLORN: Will I be able to pledge for additional reward after the campaign ends? Will I be able to turn my $1 pledge in to a game pledge? Will there be a Pledge Manager?

Yes, yes and yes! However, bear in mind that items on offer are discounted and after the Kickstarter ends, prices may go up. All $1 backers will have a short grace period when they will be able to upgrade pledges and buy add-ons for original prices.