I think this will do the job: it's largely a matter of copying the definitions pertinent to \supercite into the commands that define \textcite. Please note that I have "hardwired" this, in other words it will not adapt automatically to changes in "autocite", so if you stopped using "autocite=superscript" you would need to delete the redefinitions too.
Also, as with other superscript references, pre- and postnotes are not printed, but a warning is written to the log.
\documentclass{report}
\usepackage[backend=bibtex8,autocite = superscript]{biblatex}
\usepackage{filecontents}
\begin{filecontents}{ABib.bib}
@article {article1,
AUTHOR = {Author, A. N.},
TITLE = {A sample paper},
JOURNAL = {Sample journal},
VOLUME = {1},
YEAR = {2013},
NUMBER = {1},
PAGES = {1--2}}
\end{filecontents}
\addbibresource{ABib.bib}
\makeatletter
\renewbibmacro*{textcite}{%
\iffieldequals{namehash}{\cbx@lasthash}
{\mkbibsuperscript{\supercitedelim}}
{\cbx@tempa
\ifnameundef{labelname}
{\printfield[citetitle]{labeltitle}}
{\printnames{labelname}}}%
\ifnumequal{\value{citecount}}{1}
{}
{}%
\mkbibsuperscript{\usebibmacro{cite}}%
\savefield{namehash}{\cbx@lasthash}%
\gdef\cbx@tempa{\addspace\multicitedelim}}%
\DeclareCiteCommand{\textcite}
{\let\cbx@tempa=\empty
\undef\cbx@lasthash
\iffieldundef{prenote}
{}
{\BibliographyWarning{Ignoring prenote argument}}%
\iffieldundef{postnote}
{}
{\BibliographyWarning{Ignoring postnote argument}}}
{\usebibmacro{citeindex}%
\usebibmacro{textcite}}
{}
{}
\makeatother
\begin{document}
Someone saw something \autocite{article1}.
\textcite{article1} saw something.
\end{document}
Producing:

\autocite,\textciteboth to give superscripts for references ? You do not want to use\supercite(which prints superscripted references) ? – ach May 17 '13 at 19:56\textciteto be superscript (since the superscript option is chosen for biblatex). The MWE produces a "^1" for the\autocitebut\textciteproduces an inline style reference number "[1]" after the author name and year. I would have expected\textciteto typeset the reference number using the same style as the other citations. – Chris May 17 '13 at 20:41