Yes, we are working on it and we will provide the Keen BS5 update soon. At the moment we can't confirm the ETA but we will do our best to release it as soon as possible.
Please note that on Themeforest we sell the Metronic theme while Keen sold on Bootstrap Marketplace.
You're right. My bad on saying Theme Forest, I confused Bootstrap Marketplace with that. So, if I buy the theme Keen now, will I have access to future updates?