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Please don't quote.

I'm currently working at a firm in NY and will be splitting with a trial boutique on the West Coast. I've enjoyed the first firm a lot and am hoping to enjoy the next as well. I recently received an email from a partner at a trial boutique located elsewhere in the country (e.g., Susman Godfrey, Bartlit Beck) asking me if I'd like to chat about the firm sometime soon.

I definitely would like to keep my options open with his firm for after I finish my clerkship, but I'm a little unsure about the propriety of setting up informational interviews right in the middle of 2L summer. I don't want to come off as flighty or uncommitted when I'm already splitting.

Any thoughts on this?

Lawyers are talking to lawyers at other firms on an informal basis all the time, for networking's sake (and friendship).
Coffees, lunches, dinners, bar association events, etc.
If one of those meetings leads to a new (better?) job, great! It's not like you were "disloyal" just by taking the meeting.
I say: go for it!