Some news today, so I'll go with the good news: TRAPPIST 1-e. This blog has been dismissive of b-c-d as likely-nonatmospheric (or Venereal; -c turned out nonatmospheric). We were saving our hopes for -e.
Some constraints are in. Might be nitrogen and... methane. Wonderful Anton Petrov is pondering a Titanlike.
It's a little warm for a Titan-proper, you'd think but... this planet is tidally-locked. The starfacing side could be barren and rockey, yes. (None of these planets are as dense as is Mercury.) But the other side could hold those "ices". Like water, in ice form. Methane can exist as liquid under colder temperatures with a thick-enough envelope of some inert gas. Over Titan that's nitrogen.
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