I'm guessing if you've stuck with the E-PL1 for so long you're not going to be excited about lots of bells and whistles or a much larger camera?
Something small, light and easy to use with good image quality?
The obvious successor to your E-PL1 is the E-PL10 - it's a little bigger but has a higher resolution sensor, better screen, better stabilisation, WiFi for image transfer and remote control.
It's the smallest Micro 4/3rds camera Olympus now make.
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The OM-D E-M?? line cameras come in 3 model lines which cover size, features and cost- like BMW 1, 3 and 5 series get bigger and more expensive.
Then there are revisions to each mark i, mark ii etc. based on their age.
OM-D E-M10 is the smallest and cheapest
E-M5 is slightly larger, more expensive and has more features (mostly)
E-M1 is the larger again, much more expensive and many more features.
E-M1X is even bigger, more expensive etc.
Their latest, greatest is the OM1 just released and the last Olympus branded camera released by the new owner of the camera division. Olympus sold their camera division to a new company called OM Digital Systems last year.
If you wanted something with an electronic view finder (EVF) as well as a touch screen then the E-M10 line is great. I have an E-M10ii which has been replaced by the iii, iiiS and iv but none of them have enough features to encourage me to pay to upgrade. I started on the E-PL5 and moved on via the mark i M10.
I'm sure either the E-M10iiiS or the iv will be a massive step up from what you currently have and give you lots of lovely pictures
I'd be quite happy with a newer Olympus, say an O-MD mark IV, but am aware that my lenses will fit other brands.
You're right that your lenses will fit on any Micro 4/3rds (a.k.a. M43) camera.
Panasonic are the other major manufacturer
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The GX80 and GX9 are the smaller bodies but I don't know a lot about them.
In general people rate Olympus for stills and Panasonic for video but they're all very capable.
For my money, if you're happy to go used then the E-M10 mark ii is an absolute bargain - though they're also getting reasonably old these days.
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If you want to easily compare the cameras I'm mentioned for size I've put a link here.
They don't have the E-PL10 but the 9 is quite similar.
Compare unlimited number of cameras with lenses, see how compact or bulky a camera is and sort by height, width, depth and weight.
bit.ly
All the pictures linked from Flickr in my signature are taken on Olympus cameras, anything in the last few years on the M10ii.