Without abusing the usual commands, you can redefine abstract and patch the \maketitle command:
\documentclass[a4paper,12pt,titlepage]{scrartcl}
\newsavebox{\abstractbox}
\renewenvironment{abstract}
{\begin{lrbox}{0}\begin{minipage}{\textwidth}
\begin{center}\normalfont\sectfont\abstractname\end{center}\quotation}
{\endquotation\end{minipage}\end{lrbox}%
\global\setbox\abstractbox=\box0 }
\usepackage{etoolbox}
\makeatletter
\expandafter\patchcmd\csname\string\maketitle\endcsname
{\vskip\z@\@plus3fill}
{\vskip\z@\@plus2fill\box\abstractbox\vskip\z@\@plus1fill}
{}{}
\makeatother
\usepackage{lipsum}
\begin{document}
\titlehead{University}
\title{Title}
\subject{Subject}
\author{Author}
\begin{abstract}
\lipsum[1]
\end{abstract}
\maketitle
\end{document}
You can play with the line
{\vskip\z@\@plus2fill\box\abstractbox\vskip\z@\@plus1fill}
changing 2fill and 1fill till the result is pleasing.
The strategy is to save the abstract's typeset contents in a box for later use; the method with lrbox is rather standard; the only subtle point is to globally save the box, as we are doing the business inside the abstract environment. So the abstract is typeset in box register 0 and then the register \abstractbox is globally loaded with what's in \box0.
Where do you want it? Just between the \date and \publishers fields in the title page; so I looked at the code of \maketitle and found that between the two fields the code is
\vskip\z@\@plus3fill
(leave a flexible vertical space). With the help of etoolbox I change that code into
\vskip\z@\@plus2fill\box\abstractbox\vskip\z@\@plus1fill
so the previously saved box is typeset there, separated from the \date and \publisher fields by flexible vertical space.
Of course, the abstract environment must go before \maketitle. The code for typesetting the abstract itself is taken from the definition in scrartcl.cls, which basically puts "Abstract" (in the font used for section headings) centered above the text, which in turn is in a quotation environment.

scrartcl? – jvriesem Jan 09 '16 at 19:11