Admins have asked me to deliver the following information.
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First of all, the earliest the merge can happen is 16th july.
Secondly, there are 2 options on how to do it. There is an idea to merge at the 1st of next month after new heroes are announced and have 2 heroes for each class: 1 from x5 and 1 from x15. The other idea is to merge as soon as possible, clear all current heroes but let everyone keep their points (since they dedicated their own time to farm them and it isn't our right to delete their playtime). You will have ~10 days to decide the heroes for next month.
And last but not least, the merge process will last for approximately 1 day.
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Let me know what you guys think the best idea is.