To those out of the loop:

League of Legends (abbreviated LoL) is a multiplayer online battle arena video game developed and published by Riot Games for Microsoft Windows and OS X. The game follows a freemium model and is supported by microtransactions, and was inspired by the Warcraft III: The Frozen Throne mod, Defense of the Ancients.

In League of Legends, players assume the role of an unseen "summoner" that controls a "champion" with unique abilities and battle against a team of other players or computer-controlled champions. The goal is usually to destroy the opposing team's "nexus", a structure which lies at the heart of a base protected by defensive structures. Each League of Legends match is discrete, with all champions starting off fairly weak but increasing in strength by accumulating items and experience over the course of the game

-source: Wikipedia

So, the game took enormous proportions since its release back in 2009, spawning a huge competitive scene which uses LoL as the basis. It also helped gather momentum for eSports, as it's one of the bets from the entertainment market to become the "next big thing" in the near future.

The North American league (NA LCS) is arguably the richest one, with some of the most traditional teams. One of them, Team SoloMid (TSM), has by far the biggest following, and was formed by a former professional player from the competitive scene called Andy Dinh - also known as Reginald or Regi.

Regi gave an interview to another former pro-player Scarra talking about how patches (updates from Riot Games on a fortnight basis that make balance changes and adds some new stuff to the game from time to time) affect the teams' preparations, especially when these changes take place in the midst or just a week before playoffs - as it happened this year, and happened in the previous one when the World Championship, which reunites the best teams from the globe, took the stage.

https://np.reddit.com/r/leagueoflegends/comments/4z1eec/reginald_on_how_riots_major_patch_changes_hurt/

One of Riot's founders and now president Marc Merrill (aka Tryndamere) decided to come out of the left field and call Regi "cheap" for investing on other games/eSports instead of putting all his resources on League of Legends, as well as taking a "mea culpa" for screwing up the teams just before the biggest competition of the year.

https://pbs.twimg.com/media/CqfXxdBVMAAiYs2.jpg (the original comment)

Later on, Merrill "clarified" his views via an edit. But the damage had already been done.

https://np.reddit.com/r/leagueoflegends/comments/4z1eec/reginald_on_how_riots_major_patch_changes_hurt/d6sarg4

TSM's head coach Weldon rebutted his arguments with no gloves.

https://np.reddit.com/r/leagueoflegends/comments/4z1eec/reginald_on_how_riots_major_patch_changes_hurt/d6sc6jp

Drama ensued later on Twitter, with many personalities of the League competitive scene giving their opinions - most of them negative - about Tryndamere's remarks. One of them was Montecristo, who's a English caster for the Korean scene, which is the most successful one within LoL.

https://np.reddit.com/r/leagueoflegends/comments/4z42pj/montecristo_on_twitter_regarding_riot_cofounder/

Then Montecristo released a video, explaining further why Tryndamere was a bit underhanded in his comment.

https://np.reddit.com/r/leagueoflegends/comments/4z5m7b/montecristo_montes_musings_tryndamere_posts_on/

There was also a comment from a redditor defending Riot's model for the LCS, which has a stark contrast in tone within the comments compared to the other trends.

https://np.reddit.com/r/leagueoflegends/comments/4z4th2/an_analysis_of_lcs_and_why_it_exists/

One important thing: the drama seems to have been brewing for a long time, according to one journalist with close ties to the NA scene and its teams.

https://twitter.com/TravisGafford/status/767830452929298432

More videos/responses are set to come forth from other important figures, such as Reginald himself. Guess we should stay tuned!