It’s been a decade since RF Online came out (that stands for Rising Force Online, not anything else that could be abbreviated with those two letters), and developer CCR followed up on that first release with absolutely nothing. No further games have come out since then or been announced. But a new trademark has been filed that might just hint at the developer’s future.
The trademark in question is for RF 2, which eagle-eyed observers will note is the old title with a number appended, indicating that it is some sort of derivative work intended for placement in sequential order. A sequel, if you will. Nothing has actually been announced yet, but if you have fond memories of RF Online or just like seeing what happens with trademarks, keep your eyes open.