So while discovering the nuggets above, I also found this:

Yarrr! ‘Flint & Silver’ To Sail To the Big Screen – The Moviefone Blog

Now, before you wet yourself in excitement, note that the story is from March of 2008 – so it would appear this is just one of the many unsubstantiated pirate movie rumors. So now we have Captain Blood in Space, Blackbeard (in his own film), AND Long John to not look forward to seeing. Yar. (That’s a sad yar. You can tell because it’s punctuated with a period instead of a more festively enthusiastic exclamation point.)

Not be be too blunt, but Flint and Silver is exceptional work. The characters of Long John Silver and Joseph Flint are fleshed out and expanded upon in incredible, believable detail. Long John is every bit the dubious anti-hero he was in Treasure Island, and more-so. Flint, on the other hand, being only referenced in the original novel, is an original character of a truly compelling nature – clever, heartless, bitter, yet human. To see the friendship between the two develop, flourish, and then crumble is an adventure every bit as worthy as was Treasure Island itself. And to see the development of other “minor” characters develop alongside – Mad Dog, Blind Pew, Billy Bones… only adds to the fun, and further helps establish this as a ‘genuine’ prequel of which Rober Louis Stevenson would surely approve.

Beginning with Silver’s reluctant initiation into the ways of the Brethren of the Coast, the story traces his rapid rise to quartermaster (further advancement being staved off by his frustrating inability to master the arts of navigation) and eventual teaming up with Flint – Naval Lieutenant turned mutineer and eventual pirate captain. Each man finds he perfectly compliments the other in skill – Silver being a true leader of men, and Flint being a master navigator and strategist. Together they form a wildly successful pirate career until their inherent differences in motivation and humanity drive them apart. As the story unfolds, you can clearly see the foundation of Treasure Island laid out, although not to final completion as it would appear that one more novel remains before we would see the introduction of Jim Hawkins and company. I await this book with baited breath, and once you’ve read Flint and Silver, I’m confident you’ll feel the same.