GRGR (17): ammendations?

[Peter Petto]

rj wrote:

>Any editorial changes to a text for a new edition
>(not a reprint) have to be OKed by the author first.

Is it typical for publishers to submit spelling/grammatical corrections to 
authors when a new edition is being readied for printing? (Or vice versa?)

How many "new editions" have their been for Gravity's Rainbow. Is anything 
with page numbers matching the original a reprint?