• Improve Mobile App reporting

• Fix your map generator and generate a reasonable up-to-date world map

Of course I like new features like "Compare report data for two different periods" very much :-)

Maybe one should spend same amount of work also on 3 other fields:

1. making existing functionality even easier to use/to understand for "average users" (not every one is a high power user):
   have a look at the open issues with label "major" and "c: usability"
   https://github.com/piwik/piwik/issues?page=1&q=is%3Aissue+is%3Aopen+label%3Amajor+label%3A%22c%3A+Usability%22&utf8=%E2%9C%93
   there are some really interesting ones ;-)
   like:

• SegmentEditor: display readable values for some metrics (e.g. FF -> Firefox) SegmentEditor: display readable values for some metrics (e.g. FF -> Firefox) #5309
• make a difference in graphs for data of "unfinished periods" and "complete periods" Show difference in graphs for data of "unfinished periods" and "complete periods" #10291

2. fixing bugs and messed up things in the field of data quality / data presentation

• open issues with label "bug" and "wrong" with or without priority backlog
  https://github.com/piwik/piwik/issues?utf8=%E2%9C%93&q=is%3Aissue%20is%3Aopen%20label%3Abug%20wrong%20
• or things like this: visitor profile: built image of vistor is distorted Visitor profile, display complete summary of all visits (Referrers, Cities, IPs, Providers, etc.) #9507

3. adding value adding features the "average user" notice/use the most often (in daily life)...
   (examples will follow)

• Compare report data not only for n different periods but also for n different segments

Thanks for your suggestions. We've worked on the Data & Segment comparison which will be available in Matomo 3.12.0 very soon. #14365

Also Matomo 4.0.0 is more or less planned, see the milestone: https://github.com/matomo-org/matomo/milestone/102

we also have milestones for 4.1 and 4.2 already... Check it out & stay tuned!