As of today there has been a rumour in Wrocław that Linkin Park will play there on June 5th. The date is still unconfirmed. The local radio station says:
"From what we know Linkin Park will play on Wrocław's stadium in June. Official informations will be announced next week. We now know that Linkin Park will play in the capital city of Dolny Śląsk"
Even a local newspaper Gazeta Wrocławska says that the concert info is "reliable".
A week ago, the Polish division of Eventim asked on their Facebook page: "What would you say for a Linin Park concert in Poland?"
Sources:
Radio Wrocław
Gazeta Wrocławska
Credit to linkinpark.pl for the information!
2/5/14 EDIT: Linkin Park just confirmed via facebook that they are going to Wroclaw, Poland on June 5th.
We are so excited to announce we will be playing a headline show in the beautiful city of Wroclaw, Poland. June 5th. Stadium Wroclaw.
LPU members can access pre-sale tickets starting on Friday February 7, at 1:00am PST (10:00am local Poland time). General sale will begin Monday February 10, at 1:00am PST (10:00am local Poland time). See you in June!!! -BBB
LP Underground Pre-Sale Info: http://lpunderground.com
General Sale Link: http://www.eventim.pl/linkin-park
Source