A new piece of writing in Lusitanian was discovered at Ribeira da Venda in 2008 and a paper on it (only in Portuguese, alas) has been published on it:http://ifc.dpz.es/recursos/publicaci...rneiroetal.pdf.
The inscription reads:
[- - - - - - - -] XX • OILAM • ERBAM
HARASE • OILA • X • BROENEIAE • H
OILA • X • REVE AHARACVI • T • AV [...]
IFATE(or IEATE) • X • BANDI HARACVI AV [....]
MVNITIE CARIA(or CARLA) CANTIBIDONE •
APINVS • VENDICVS • ERIACAINV[S]
OVOVIANI [?]
ICCINVI • PANDITI • ATTEDIA • M • TR
PVMPI • CANTI • AILATIO

It's being discussed on the Continental Celtic list. I've also been told by someone who knows a lot more than me that Iccona probably isn't Epona, and that k'w becoming cc and not p is unlikely. Also, this new inscription has harase and (a)haracui, so -r- between vowels (above) can only become -h- before E.