Naming: OK  (mostly)
(I think I'd prefer to simply call this "milou", without the artificial plasma- prefix, but we're already using that in other plasma applets, so maybe it's too late to reverse course now)

1. URL Not OK
Please use,
URL: https://projects.kde.org/projects/kde/workspace/milou

2. SHOULD not use %make_install macro (not recommended by packaging guidelines... yet)
I'd prefer:
make install/fast DESTDIR=%{buildroot} -C %{_target_platform}
over
%make_install -C %{_target_platform}

macros: NOT OK
3.  SHOULD use %_kf5_qmldir macro
replace
%{_qt5_prefix}/qml/org/kde/milou
with
%{_kf5_qmldir}/org/kde/milou/

sources: OK
b99660be2145dae3144e8e004c649ec6  milou-5.1.1.tar.xz

licensing: OK

scriptlets: OK

Naming: We are using kde-plasma- prefix for applets so I'm not sure right now what to use for milou. I also just realized that we already have kde-plasma-milou package so if you want to keep it we can discard this review and just update the current package.

1. Fixed
2. Fixed
3. Fixed

Spec URL: https://jgrulich.fedorapeople.org/plasma5/plasma-milou.spec
SRPM URL: https://jgrulich.fedorapeople.org/plasma5/plasma-milou-5.1.1-1.fc21.src.rpm
Description: A dedicated KDE search application built on top of Baloo
Fedora Account System Username: jgrulich

Looks good, thanks... APPROVED.


then we can retire kde-plasma-milou for f22+, I suppose for added safety you could also consider adding:
Provides: kde-plasma-milou = %{version}=%{release}

New Package SCM Request
=======================
Package Name: plasma-milou
Short Description: A dedicated KDE search application built on top of Baloo
Upstream URL: https://projects.kde.org/projects/kde/workspace/milou
Owners: group::kde-sig rdieter kkofler dvratil than jgrulich ltinkl
Branches: f21
InitialCC:

Git done (by process-git-requests).