Both the icon for Yordle Snap Trap and the actual placed traps appear to be bear traps baited with a cupcake. Because of this, many players refer to her traps simply as "cupcakes."
Likely as a reference to this, Vi uses "Cupcake" as a nickname for Caitlyn in some of her special quotes.
Caitlyn has the longest Base Attack Range out of all Champions; 650.
At level 13, Tristana's range exceeds Caitlyn's thanks to her passive, Draw a Bead. At level 18 Tristana's range will exceed Champion by 53 units.
If Jinx has maxed her Switcheroo!, using her rocket launcher will allow Jinx to outrange Caitlyn by 50 units as early as level 9.
IronStylus has stated when Caitlyn gets a visual update, she will probably have a traditional skin. He hints her look may end up being consistent with Vi, Jayce and Jinx and shows this artwork as a good example of how they might portray her afterwards. The whole article can be found here & here.
Caitlyn's"Meet the long gun of the law" quote is a pun on the phrase "Long Arm of the Law".
Caitlyn's quote "Wanna see a hat trick?" is a double entendre referring to the magic hat-trick which is producing an object out of an seemingly empty top hat (similar to the one Caitlyn wears) and the sports term hat trick - doing a triple-feat in any sport e.g. triple-kill in League of Legends, three touchdowns, three goals, etc.
Caitlyn's"Boom. Headshot." quote is a reference to the mockumentary Pure Pwnage episode "M8's," which is also referenced by the Team Fortress 2 "Meet the Sniper" video, in which the eponymous class/character says it while tapping a bobblehead. This quote could also be derived from the classic N64 game "Conker's Bad Fur Day"
In Polish client, Caitlyn's"Bądź czujny jak pies podwójny" ("Be open-eyed, as the doubledog") is a reference to stand-up of Kabaret Moralnego Niepokoju - Wyrywanie Lachonów.
Caitlyn's "So many bad guys, so little time" quote is a reference to a Frank Zappa quote "So many books, so little time"
This skin might be a reference to the Arctic Warfare series of sniper rifles by Accuracy International.
The skin was a special gift for those who bought the PC Gamer US November 2011 Issue in September 2011. The skin was later made available for everyone to purchase on December 29, 2011.
More clearly, this skin is an homage to the legendary Finnish sniper Simo Häyhä, who killed 505 Russian soldiers and officers over a span of 100 days during the Russian invasion of Finland in the winter of 1939-1940. Simo has the highest number of confirmed kills of any sniper in any major war in history.