Role organization:

Delete useless files
percona-xtrbackup is optional on Wheezy (unless you use percona apt)
better organization in mysql vendors

tasks/install/percona/apt.yml

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+---
+
+- name: APT_KEY | Install Percona key
+  apt_key: keyserver="keyserver.ubuntu.com" id="1C4CBDCDCD2EFD2A" state=present
+
+- name: TEMPLATE | Deploy APT pinning (prevent upgrades from Debian)
+  template: src=../../../templates/etc/apt/preferences.d/95-percona.j2 dest=/etc/apt/preferences.d/95-percona
+
+- name: APT_REPOSITORY | Add Percona repository
+  apt_repository: repo='deb {{ percona_repository }} {{ ansible_distribution_release }} main' state=present
+
+- name: APT_RESPOSITORY | Add Percona (src) repository
+  apt_repository: repo='deb-src {{ percona_repository }} {{ ansible_distribution_release }} main' state=present
+

tasks/install/percona/upstream.yml

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+---
+
+# We prevent double include
+- name: INCLUDE | Add percona APT repository
+  include: apt.yml
+  when: not mysql_use_percona_repository
+
+- name: SET_FACT | We use percona repository
+  set_fact: mysql_use_percona_repository=true
+
+- name: DEBCONF | Prepare MySQL silent installation (root password)
+  debconf: name='percona-server-server-{{ percona_version }}' question='percona-server-server/root_password' vtype='password' value='{{ mysql_root_password }}'
+  when: not mysql_exists.stat.exists
+
+- name: DEBCONF | Prepare MySQL silent installation (root password)
+  debconf: name='percona-server-server-{{ percona_version }}' question='percona-server-server/root_password_again' vtype='password' value='{{ mysql_root_password }}'
+  when: not mysql_exists.stat.exists
+
+- name: APT | Install Percona
+  apt: update_cache=yes cache_valid_time=3600 pkg='percona-server-server-{{ percona_version }}' state=latest
+